Peter,
If there is no load on this_cpu, (i.e. tl_per_task is 0), we will fail the
"tl + target_load(cpu, idx) <= tl_per_task" check. I think the original intention was
to put task on this_cpu if it has no load and when there's already one task on
cpu. This helps spread tasks out for low load condition.
Thanks.
Tim
Signed-off-by: Tim Chen <[email protected]>
--- linux-2.6.16-mm2-a/kernel/sched.c 2006-03-28 16:00:37.091779904 -0800
+++ linux-2.6.16-mm2-b/kernel/sched.c 2006-03-28 16:09:08.237074008 -0800
@@ -1393,7 +1393,7 @@ static int try_to_wake_up(task_t *p, uns
if (this_sd->flags & SD_WAKE_AFFINE) {
unsigned long tl = this_load;
- unsigned long tl_per_task = cpu_avg_load_per_task(this_cpu);
+ unsigned long sl_per_task = cpu_avg_load_per_task(cpu);
/*
* If sync wakeup then subtract the (maximum possible)
@@ -1404,7 +1404,7 @@ static int try_to_wake_up(task_t *p, uns
tl -= current->load_weight;
if ((tl <= load &&
- tl + target_load(cpu, idx) <= tl_per_task) ||
+ tl + target_load(cpu, idx) <= sl_per_task) ||
100*(tl + p->load_weight) <= imbalance*load) {
/*
* This domain has SD_WAKE_AFFINE and
-
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